The original X-Men -including Lorna Dane- had been captured by Krakoa, the living island. Professor X sent a rescue team composed of young, unexperienced mutants, among which was Gabriel Summers a.k.a. Vulcan. But Krakoa proved to be too powerful, too evil for this group and most of them were killed in action.
It was then that Professor X recruited a second rescue team composed of mutants from all over the world. Ororo Munroe a.k.a. Storm was one of them. When the all-new, all-different X-Men arrived to Krakoa, they freed the original team, and then Storm and Lorna Dane used their amazing powers to repel the living island off the surface of the Earth. Unknown to them, young Gabriel Summers was on Krakoa when it got launched into space!
Giant Size X-Men #1 (1975)